docs: def get_rdns_name(rdns):
      """
      Gets the rdns String name
      :param rdns: RDNS object
      :type rdns: cryptography.x509.RelativeDistinguishedName
      :return: RDNS name
      """
      name = ''
      for rdn in rdns:
          for attr in rdn._attributes:
              if len(name) > 0:
                  name = name + ','
              if attr.oid in OID_NAMES:
                  name = name + OID_NAMES[attr.oid]
              else:
                  name = name + attr.oid._name
              name = name + '=' + attr.value
      return name